JPH10196839A - Valve operation device having surface box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly operate the opening/closing of a valve by providing a bearing fixed to a frame body constituting a surface box provided in a pit incorporating a valve and providing an upper and lower direction valve operation shaft supported on this bearing and connected to the valve shaft of the valve. SOLUTION: A surface box 7 is provided in the upper end of a pit 6 incorporating a valve, a flange part 9 is provided in this surface box 7 to be positioned along the upper end outer peripheral edge of a cylindrical body 8 and a cap body 10 is attached to this flange part 9. The flange part 9 is placed on a slab 11 via a mortar layer 12 and fixed by anchor bolts 13. A bearing attaching seat 15 is formed in the lower end of the cylindrical body 8, the case 18 of bearings 16 and 17 is connected to this bearing attaching seat 15 by bolts 19 and, by the upper and lower bearings 16 and 17, an upper and lower direction valve operation shaft 21 for operating a valve shaft 20 is pivotally supported. A universal joint 22 is provided in the lower end of the valve operation shaft 21 and the valve shaft 20 is connected to the other end of the universal joint 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve operating device having a surface box provided in a pit provided with a valve.

[0002]

2. Description of the Related Art As shown in FIG. 2, a valve 2 installed in a pit 1 is provided with an operating shaft 3 for opening and closing the valve 2. A surface box 4 provided in an opening of the pit 1 The main function is to protect the distal end of the operation shaft 3 and to prevent dust and the like from entering the pit 1.

[0003]

However, since the self-weight of the operation shaft 3 is applied to the lower valve 2, if the shaft length becomes long, a new device for supporting the self-weight of the operation shaft 3 is required. Become.

Since the surface box 4 is usually buried in the concrete slab 5, it cannot always be arranged at an appropriate position, and may not be arranged right above the valve 2 or its operating shaft 3. In that case, it is difficult to open and close the valve 2.

[0005] Also, since there is no safety device against overload,
When an overload is applied, the operating shaft 3 may be twisted or the valve 2 may be damaged. An object of the present invention is to solve the above-described problem, and to protect a valve and its operating shaft even when a surface box is not arranged directly above a valve, and to provide a smooth opening and closing operation of the valve. It is assumed that.

[0006]

According to a first aspect of the present invention, there is provided a valve operating device having a surface box provided in a pit provided with a valve. An operating device, wherein a bearing is provided fixed to a frame constituting a surface box, and a vertical valve operating shaft connected to a valve shaft of the valve is provided on the bearing.

According to a second aspect of the present invention, there is provided a valve operating device having a surface box, wherein a universal joint is provided at the lower end of the valve operating shaft and connected to the valve shaft at the other end. According to a third aspect of the present invention, there is provided a valve operating device having a surface box, wherein a slip clutch is provided above a valve operating shaft.

[0010] According to the configuration of the first aspect, since the valve operating shaft is supported by the bearing, the opening and closing operation of the valve can be performed smoothly. When a radial / thrust bearing is provided as the bearing, the own weight of the valve operating shaft can be received by the surface box.

According to the second aspect of the present invention, even if the surface box is not arranged at an appropriate position, and a misalignment occurs between the valve shaft and the valve operation shaft, it can be absorbed by the universal joint. The opening and closing operation of the valve can be performed smoothly.

According to the third aspect of the present invention, even when an overload is applied, the slip clutch does not transmit power of a predetermined magnitude or more, so that the valve operating shaft is not twisted and the valve is not damaged.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a surface box 7 is provided at an upper end of a pit 6 in which a valve (not shown) is provided.

The surface box 7 is provided with a flange 9 along the outer peripheral edge of the upper end of the cylindrical body 8, and the flange 9 is provided with a cover 10
And the cylindrical body 8 is a concrete slab 1
1, the flange 9 is placed on the slab 11 via the mortar layer 12, and is fixed by the anchor bolt 13. When the valve is not opened or closed, the lid 10 is locked to the flange 9 with a padlock 14 or the like as shown in the figure. When the valve is opened or closed, the padlock 14 is removed and the lid 10 is removed. Is opened.

A ring-shaped bearing mounting seat 15 is formed at the lower end of the cylindrical body 8, and a case 18 of a first bearing 16 and a second bearing 17 is connected to the bearing mounting seat 15 by bolts 19. A vertical valve operating shaft 21 for operating the valve shaft 20 is provided, supported by bearings 16 and 17.

A universal joint 22 is provided at a lower end of the valve operating shaft 21, and the other end of the universal joint 22 is connected to the valve shaft 20. A cap 23 is provided at the upper end of the valve operation shaft 21, and a variable slip clutch 24 is interposed below the cap 23.

According to the above configuration, since the valve operating shaft 21 is supported by the first and second bearings 16 and 17, the valve can be opened and closed smoothly. When a radial / thrust bearing is provided as the first bearing 16,
The own weight of the valve operation shaft 21 can be received by the surface box 7.

Further, when the surface box 7 cannot be installed right above the valve, for example, the valve shaft 20 and the valve operating shaft 21
When the misalignment occurs, the universal joint 22 can absorb the misalignment, and the opening and closing operation of the valve can be performed smoothly.

Also, when the cap 23 is overloaded, the lower slip clutch 24 transmits only the power up to a predetermined magnitude downward, and the valve operating shaft 21
There is no risk of twisting or damaging the valve.

[0018]

As described above, according to the present invention, by providing the valve operating shaft by supporting the surface box,
The opening and closing operation of the valve can be performed smoothly, and the weight of the valve operation shaft can be carried by the surface box.

Further, by connecting the valve shaft and the valve operation shaft via a universal joint, it is possible to absorb the misalignment caused when the surface box cannot be installed right above the valve, and the like. Opening and closing operations can be performed smoothly.

Further, by interposing a slip clutch on the valve operating shaft, transmission of power of a predetermined magnitude or more can be eliminated, and overload on the valve operating shaft itself and the valve can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which a valve operating device having a surface box according to an embodiment of the present invention is provided in a pit in which a valve is provided.

FIG. 2 is an explanatory view showing a state in which a conventional surface box is provided in a pit in which a valve is provided.

[Explanation of symbols]

 6 Pit 7 Surface box 8 Cylindrical body 16 First bearing 17 Second bearing 20 Valve shaft 21 Valve operating shaft 22 Universal joint 24 Slip clutch

Claims (3)

[Claims] 1. A valve operating device having a surface box provided in a pit in which a valve is provided, wherein a bearing is fixedly mounted on a frame constituting the surface box, and the valve is supported by the bearing. A valve operating device having a surface box, wherein a vertical valve operating shaft connected to the valve shaft is provided. 2. A valve operating device having a surface box according to claim 1, wherein a universal joint connected to the valve shaft at the other end is provided at a lower end of the valve operating shaft. 3. The valve operating device having a surface box according to claim 1, wherein a slip clutch is interposed on an upper portion of the valve operating shaft.